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Route · SEA → EWR · 2020–2025 BTS data

Seattle to Newark

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to EWR (Seattle to Newark) ranks #1093 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

79.8%
On-time
+0.8 pts
vs US avg
70 min
Delay when late
10,549
Flights
#1093 of 4927
Corpus placement

Cancelled

1.7%

Best Month

Oct 2024 90%

Worst Month

May 2025 53%

Distance

2,402 mi

Carriers

4

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 179 35 1 0 AS,UA
Nov 2025 171 26 9 3 UA,AS
Oct 2025 206 38 3 0 AS,UA
Sep 2025 227 29 0 0 UA,AS
Aug 2025 229 67 2 0 UA,AS
Jul 2025 217 81 7 4 AS,UA
Jun 2025 170 49 1 0 AS,UA
May 2025 134 63 2 0 AS,UA
Apr 2025 127 29 0 2 UA,AS
Mar 2025 129 19 0 1 AS,UA
Feb 2025 102 16 0 0 AS,UA
Jan 2025 116 16 0 1 AS,UA
Dec 2024 143 24 1 0 AS,UA
Nov 2024 142 27 0 0 UA,AS
Oct 2024 177 17 1 2 UA,AS
Sep 2024 205 40 0 1 UA,AS
Aug 2024 215 50 11 3 AS,UA
Jul 2024 216 66 6 1 AS,UA
Jun 2024 210 50 2 1 AS,UA
May 2024 194 54 0 0 AS,UA
Apr 2024 143 33 1 2 AS,UA
Mar 2024 134 16 1 0 AS,UA
Feb 2024 116 18 1 0 AS,UA
Jan 2024 129 24 18 0 AS,UA

SEA–EWR seasonal on-time pattern

Best: March (86.9%) · weakest: May (73.8%)

70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 74.5%

Strongest calendar month

March

86.9% on-time · ~128 flights/mo

Busiest calendar month

August

~187 flights/mo avg

Weakest calendar month

May

73.8% on-time · ~134 flights/mo

Cancellation Rate

1.7%

67 of 4,031 flights

Diversion Rate

0.5%

21 of 4,031 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

SEA - Seattle

Full on-time, delay-cause, and seasonal performance for Seattle, WA.

SEA on-time profile

EWR - Newark

Full on-time, delay-cause, and seasonal performance for Newark, NJ.

EWR on-time profile

Compare the two airports

See SEA and EWR side by side on delays, cancellations, and reliability.

Compare SEA vs EWR

Origin-hub reliability standing

Mid-pack among SEA departures

From SEA, this corridor sits with 63 other 75–85% on-time routes out of 89 tracked departures, not the hub's reliability leaders (25 at ≥85%) and not the softest ( 1 below 75%). Destination: Newark · fleet on-time rank #3244 of 4927.

What the Data Says About SEA to EWR

10,549 tracked flights put the SEA to EWR pairing (Seattle to Newark) at a 79.8% on-time rate, squarely in line with the wider network. Delays that do occur run 69.7 minutes on average. Across the 2,402-mile route and its 4 carriers, the trailing 24 months show 1.7% cancelled and 0.5% diverted (4,031 flights sampled).

The monthly split is wide on this route: Oct 2024 posted the strongest performance at 90% on-time, while May 2025 came in at just 53% - a 37-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–EWR peaks in March at 86.9% on-time while August carries the heaviest traffic (~187 flights per month) ; the softest month is May at 73.8%, a 13.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to EWR rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to EWR ranks #1093 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from SEA to EWR? ▼
Flights from Seattle to Newark have a 79.8% on-time rate based on 10,549 flights. The average delay is 69.7 minutes. The best recent month was Oct 2024 with 90% on-time.
What is the cancellation rate for SEA to EWR? ▼
Over the last 24 months, 1.7% of flights on this route were cancelled (67 of 4,031 flights) and 0.5% were diverted.
How far is the flight from SEA to EWR? ▼
The flight distance from Seattle (SEA) to Newark (EWR) is approximately 2,402 miles. This route is served by 4 carriers.
When is the best time to fly from SEA to EWR? ▼
The best recent month for on-time performance was Oct 2024 (90% on-time). The worst was May 2025 (53% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
EWR Airport

Newark
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using SEA–EWR data

SEA–EWR is mid-pack at 79.8% on-time; month and carrier mix move more than the corridor headline.

  • Compare SEA and EWR airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, March (86.9% on-time) beats May (73.8%) on this corridor. Seasonal chart
  • 4 other routes post a similar 79.8% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.